-0.00000001642x^3+0.00005571*x^2-0.07231*x+66.2=49.6
    30x十50=200
    x^(2)+75x-1350=0
    20x^(2)-120x+99＝0
    a^2=16
    x^2=4
    1.5（1.2x+0.6）/3=1.62
    2x+(35-x)4=72
    x/（1-x）=0.81
    20x*2-6x=68
    1.6x^2-0.2x+0.026=0
    20x^(2)-120x+89＝0
    20x^(2)-120x+89＝89
    104*0.03+x*0.97=250 138*0.03+x*0.97=226 206*0.03+x*0.97=130
    255*x+104*(1-x)=250
    （4909.24-X）/54547.14*100%=0.025
    （4909.24-X）/59456.38*100%=0.025
    (820*0.550+x) /(820+x) =0.6
    3w+21-7w=16
    2y/3+16/21=6/7

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